Organize MSC4140 things together

CHANGES.md

@@ -3,9 +3,9 @@
 ## Features
 
 - [MSC4140](https://github.com/matrix-org/matrix-spec-proposals/pull/4140): Add a dedicated endpoint for scheduling delayed events. ([\#19354](https://github.com/element-hq/synapse/issues/19354))
-- Stabilise [MSC4222](https://github.com/matrix-org/matrix-spec-proposals/pull/4222): support the stable `use_state_after` query parameter and `state_after` response field on `/sync`, as per Matrix v1.16, and remove the `msc4222_enabled` experimental config flag. ([\#20170](https://github.com/element-hq/synapse/issues/20170))
 - Require authentication for the [MSC4140](https://github.com/matrix-org/matrix-spec-proposals/pull/4140) delayed event management endpoints, restrict them to the requesting user's own delayed events, and allow guests to use them. ([\#20257](https://github.com/element-hq/synapse/issues/20257))
 - [MSC4140: Cancellable delayed events](https://github.com/matrix-org/matrix-spec-proposals/pull/4140): Reject requests to schedule a delayed event that the sender could not send at that time, such as in a room they are not joined to, unless the event changes their own membership. ([\#20266](https://github.com/element-hq/synapse/issues/20266))
+- Stabilise [MSC4222](https://github.com/matrix-org/matrix-spec-proposals/pull/4222): support the stable `use_state_after` query parameter and `state_after` response field on `/sync`, as per Matrix v1.16, and remove the `msc4222_enabled` experimental config flag. ([\#20170](https://github.com/element-hq/synapse/issues/20170))
 - Add the `m.preview_url` capability (stabilizes support for MSC4452). ([\#20298](https://github.com/element-hq/synapse/issues/20298))
 - Advertise support for Matrix v1.16. ([\#20333](https://github.com/element-hq/synapse/issues/20333))
 - Advertise support for Matrix v1.17. ([\#20334](https://github.com/element-hq/synapse/issues/20334))